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                            <div style="color:gray; word-break: break-all; font-size:12px;">原英文版地址: <a href="https://www.elastic.co/guide/en/elasticsearch/reference/7.7/copy-to.html" rel="nofollow" target="_blank">https://www.elastic.co/guide/en/elasticsearch/reference/7.7/copy-to.html</a>, 原文档版权归 www.elastic.co 所有<br/>本地英文版地址: <a href="../en/copy-to.html" rel="nofollow" target="_blank">../en/copy-to.html</a></div>
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<strong>重要</strong>: 此版本不会发布额外的bug修复或文档更新。最新信息请参考 <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html" rel="nofollow">当前版本文档</a>。
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<span class="breadcrumb-node"><code class="literal">copy_to</code></span>
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<h2 class="title">
<a id="copy-to"></a><code class="literal">copy_to</code><a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.7/docs/reference/mapping/params/copy-to.asciidoc">edit</a>
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<p>The <code class="literal">copy_to</code> parameter allows you to copy the values of multiple
fields into a group field, which can then be queried as a single
field. For instance, the <code class="literal">first_name</code> and <code class="literal">last_name</code> fields can be copied to
the <code class="literal">full_name</code> field as follows:</p>
<div class="pre_wrapper lang-console">
<pre class="programlisting prettyprint lang-console">PUT my_index
{
  "mappings": {
    "properties": {
      "first_name": {
        "type": "text",
        "copy_to": "full_name" <a id="CO336-1"></a><i class="conum" data-value="1"></i>
      },
      "last_name": {
        "type": "text",
        "copy_to": "full_name" <a id="CO336-2"></a><i class="conum" data-value="1"></i>
      },
      "full_name": {
        "type": "text"
      }
    }
  }
}

PUT my_index/_doc/1
{
  "first_name": "John",
  "last_name": "Smith"
}

GET my_index/_search
{
  "query": {
    "match": {
      "full_name": { <a id="CO336-3"></a><i class="conum" data-value="2"></i>
        "query": "John Smith",
        "operator": "and"
      }
    }
  }
}</pre>
</div>
<div class="console_widget" data-snippet="snippets/748.console"></div>
<div class="calloutlist">
<table border="0" summary="Callout list">
<tr>
<td align="left" valign="top" width="5%">
<p><a href="#CO336-1"><i class="conum" data-value="1"></i></a><a href="#CO336-2"></a></p>
</td>
<td align="left" valign="top">
<p>The values of the <code class="literal">first_name</code> and <code class="literal">last_name</code> fields are copied to the
<code class="literal">full_name</code> field.</p>
</td>
</tr>
<tr>
<td align="left" valign="top" width="5%">
<p><a href="#CO336-3"><i class="conum" data-value="2"></i></a></p>
</td>
<td align="left" valign="top">
<p>The <code class="literal">first_name</code> and <code class="literal">last_name</code> fields can still be queried for the
first name and last name respectively, but the <code class="literal">full_name</code> field can be
queried for both first and last names.</p>
</td>
</tr>
</table>
</div>
<p>Some important points:</p>
<div class="ulist itemizedlist">
<ul class="itemizedlist">
<li class="listitem">
It is the field <em>value</em> which is copied, not the terms (which result from the analysis process).
</li>
<li class="listitem">
The original <a class="xref" href="mapping-source-field.html" title="_source field"><code class="literal">_source</code></a> field will not be modified to show the copied values.
</li>
<li class="listitem">
The same value can be copied to multiple fields, with <code class="literal">"copy_to": [ "field_1", "field_2" ]</code>
</li>
<li class="listitem">
You cannot copy recursively via intermediary fields such as a <code class="literal">copy_to</code> on
<code class="literal">field_1</code> to <code class="literal">field_2</code> and <code class="literal">copy_to</code> on <code class="literal">field_2</code> to <code class="literal">field_3</code> expecting
indexing into <code class="literal">field_1</code> will eventuate in <code class="literal">field_3</code>, instead use copy_to
directly to multiple fields from the originating field.
</li>
</ul>
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